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lodash.core.js
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lodash.core.js
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/**
* @license
* lodash 3.10.1 (Custom Build) <https://lodash.com/>
* Build: `lodash core exports="global,amd" -o ./lodash.core.js`
* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
* Available under MIT license <https://lodash.com/license>
*/
;(function() {
/** Used as a safe reference for `undefined` in pre-ES5 environments. */
var undefined;
/** Used as the semantic version number. */
var VERSION = '3.10.1';
/** Used to compose bitmasks for wrapper metadata. */
var BIND_FLAG = 1,
PARTIAL_FLAG = 32;
/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';
/** `Object#toString` result references. */
var argsTag = '[object Arguments]',
arrayTag = '[object Array]',
boolTag = '[object Boolean]',
dateTag = '[object Date]',
errorTag = '[object Error]',
funcTag = '[object Function]',
numberTag = '[object Number]',
objectTag = '[object Object]',
regexpTag = '[object RegExp]',
stringTag = '[object String]';
/** Used to match HTML entities and HTML characters. */
var reUnescapedHtml = /[&<>"'`]/g,
reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
/** Used to detect unsigned integer values. */
var reIsUint = /^\d+$/;
/** Used to map characters to HTML entities. */
var htmlEscapes = {
'&': '&',
'<': '<',
'>': '>',
'"': '"',
"'": ''',
'`': '`'
};
/** Used to determine if values are of the language type `Object`. */
var objectTypes = {
'function': true,
'object': true
};
/** Detect free variable `exports`. */
var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) ? exports : null;
/** Detect free variable `module`. */
var freeModule = (objectTypes[typeof module] && module && !module.nodeType) ? module : null;
/** Detect free variable `global` from Node.js. */
var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);
/** Detect free variable `self`. */
var freeSelf = checkGlobal(objectTypes[typeof self] && self);
/** Detect free variable `window`. */
var freeWindow = checkGlobal(objectTypes[typeof window] && window);
/** Detect `this` as the global object. */
var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
/**
* Used as a reference to the global object.
*
* The `this` value is used if it's the global object to avoid Greasemonkey's
* restricted `window` object, otherwise the `window` object is used.
*/
var root = freeGlobal || ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) || freeSelf || thisGlobal || Function('return this')();
/*--------------------------------------------------------------------------*/
/**
* Converts `value` to a string if it's not one. An empty string is returned
* for `null` or `undefined` values.
*
* @private
* @param {*} value The value to process.
* @returns {string} Returns the string.
*/
function baseToString(value) {
return value == null ? '' : (value + '');
}
/**
* Checks if `value` is a global object.
*
* @private
* @param {*} value The value to check.
* @returns {null|Object} Returns `value` if it's a global object, else `null`.
*/
function checkGlobal(value) {
return (value && value.Object === Object) ? value : null;
}
/**
* Compares values to sort them in ascending order.
*
* @private
* @param {*} value The value to compare.
* @param {*} other The other value to compare.
* @returns {number} Returns the sort order indicator for `value`.
*/
function compareAscending(value, other) {
if (value !== other) {
var valIsNull = value === null,
valIsUndef = value === undefined,
valIsReflexive = value === value;
var othIsNull = other === null,
othIsUndef = other === undefined,
othIsReflexive = other === other;
if ((value > other && !othIsNull) || !valIsReflexive ||
(valIsNull && !othIsUndef && othIsReflexive) ||
(valIsUndef && othIsReflexive)) {
return 1;
}
if ((value < other && !valIsNull) || !othIsReflexive ||
(othIsNull && !valIsUndef && valIsReflexive) ||
(othIsUndef && valIsReflexive)) {
return -1;
}
}
return 0;
}
/**
* Used by `_.escape` to convert characters to HTML entities.
*
* @private
* @param {string} chr The matched character to escape.
* @returns {string} Returns the escaped character.
*/
function escapeHtmlChar(chr) {
return htmlEscapes[chr];
}
/**
* Checks if `value` is a host object in IE < 9.
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a host object, else `false`.
*/
function isHostObject(value) {
// Many host objects are `Object` objects that can coerce to strings
// despite having improperly defined `toString` methods.
var result = false;
if (value != null && typeof value.toString != 'function') {
try {
result = !!(value + '');
} catch(e) {}
}
return result;
}
/**
* Checks if `value` is object-like.
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
*/
function isObjectLike(value) {
return !!value && typeof value == 'object';
}
/*--------------------------------------------------------------------------*/
/** Used for native method references. */
var arrayProto = Array.prototype,
objectProto = Object.prototype,
stringProto = String.prototype;
/** Used to check objects for own properties. */
var hasOwnProperty = objectProto.hasOwnProperty;
/** Used to generate unique IDs. */
var idCounter = 0;
/**
* Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
* of values.
*/
var objToString = objectProto.toString;
/** Used to restore the original `_` reference in `_.noConflict`. */
var oldDash = root._;
/** Native value references. */
var Reflect = root.Reflect,
enumerate = Reflect ? Reflect.enumerate : undefined,
propertyIsEnumerable = objectProto.propertyIsEnumerable;
/* Native method references for those with the same name as other `lodash` methods. */
var nativeFloor = Math.floor,
nativeIsFinite = root.isFinite,
nativeKeys = Object.keys,
nativeMax = Math.max;
/** Used as references for `-Infinity` and `Infinity`. */
var NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY,
POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
/**
* Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
* of an array-like value.
*/
var MAX_SAFE_INTEGER = 9007199254740991;
/*------------------------------------------------------------------------*/
/**
* Creates a `lodash` object which wraps `value` to enable implicit chaining.
* Methods that operate on and return arrays, collections, and functions can
* be chained together. Methods that retrieve a single value or may return a
* primitive value will automatically end the chain returning the unwrapped
* value. Explicit chaining may be enabled using `_.chain`. The execution of
* chained methods is lazy, that is, execution is deferred until `_#value`
* is implicitly or explicitly called.
*
* Lazy evaluation allows several methods to support shortcut fusion. Shortcut
* fusion is an optimization strategy which merge iteratee calls; this can help
* to avoid the creation of intermediate data structures and greatly reduce the
* number of iteratee executions.
*
* Chaining is supported in custom builds as long as the `_#value` method is
* directly or indirectly included in the build.
*
* In addition to lodash methods, wrappers have `Array` and `String` methods.
*
* The wrapper `Array` methods are:
* `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`,
* `splice`, and `unshift`
*
* The wrapper `String` methods are:
* `replace` and `split`
*
* The wrapper methods that support shortcut fusion are:
* `compact`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`,
* `find`, `findLast`, `first`, `initial`, `last`, `map`, `reject`, `rest`,
* `reverse`, `slice`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`,
* and `toArray`
*
* The chainable wrapper methods are:
* `after`, `ary`, `assign`, `assignWith`, `at`, `before`, `bind`, `bindAll`,
* `bindKey`, `chain`, `chunk`, `commit`, `compact`, `concat`, `constant`,
* `countBy`, `create`, `curry`, `debounce`, `defaults`, `defaultsDeep`,
* `defer`, `delay`, `difference`, `drop`, `dropRight`, `dropRightWhile`,
* `dropWhile`, `extend`, `extendWith`, `fill`, `filter`, `flatten`,
* `flattenDeep`, `flow`, `flowRight`, `forEach`, `forEachRight`, `forIn`,
* `forInRight`, `forOwn`, `forOwnRight`, `functions`, `groupBy`, `indexBy`,
* `initial`, `intersection`, `invert`, `invoke`, `iteratee`, `keys`, `keysIn`,
* `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`, `memoize`,
* `merge`, `mergeWith` `method`, `methodOf`, `mixin`, `modArgs`, `negate`,
* `omit`, `omitBy`, `once`, `pairs`, `partial`, `partialRight`, `partition`,
* `pick`, `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAt`,
* `push`, `range`, `rearg`, `reject`, `remove`, `rest`, `restParam`, `reverse`,
* `set`, `setWith`, `shuffle`, `slice`, `sort`, `sortBy`, `sortByOrder`,
* `splice`, `spread`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`,
* `tap`, `throttle`, `thru`, `times`, `toArray`, `toPlainObject`, `transform`,
* `union`, `uniq`, `uniqBy`, `unshift`, `unzip`, `unzipWith`, `values`,
* `valuesIn`, `without`, `wrap`, `xor`, `zip`, `zipObject`, `zipWith`
*
* The wrapper methods that are **not** chainable by default are:
* `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clone`, `cloneDeep`,
* `cloneDeepWith`, `cloneWith`, `deburr`, `endsWith`, `eq`, `escape`,
* `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
* `findLastIndex`, `findLastKey`, `first`, `floor`, `get`, `gt`, `gte`,
* `has`, `identity`, `includes`, `indexOf`, `inRange`, `isArguments`,
* `isArray`, `isBoolean`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
* `isEqualWith`, `isError`, `isFinite` `isFunction`, `isMatch`, `isMatchWith`,
* `isNative`, `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`,
* `isRegExp`, `isString`, `isUndefined`, `isTypedArray`, `join`, `kebabCase`,
* `last`, `lastIndexOf`, `lt`, `lte`, `max`, `min`, `noConflict`, `noop`,
* `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`, `random`, `reduce`,
* `reduceRight`, `repeat`, `result`, `round`, `runInContext`, `shift`, `size`,
* `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
* `sortedLastIndexBy`, `startCase`, `startsWith`, `sum`, `sumBy`, `template`,
* `trim`, `trimLeft`, `trimRight`, `trunc`, `unescape`, `uniqueId`, `value`,
* and `words`
*
* The wrapper method `sample` will return a wrapped value when `n` is provided,
* otherwise an unwrapped value is returned.
*
* @name _
* @constructor
* @category Chain
* @param {*} value The value to wrap in a `lodash` instance.
* @returns {Object} Returns the new `lodash` wrapper instance.
* @example
*
* var wrapped = _([1, 2, 3]);
*
* // returns an unwrapped value
* wrapped.reduce(function(sum, n) {
* return sum + n;
* });
* // => 6
*
* // returns a wrapped value
* var squares = wrapped.map(function(n) {
* return n * n;
* });
*
* _.isArray(squares);
* // => false
*
* _.isArray(squares.value());
* // => true
*/
function lodash(value) {
if (isObjectLike(value) && !isArray(value)) {
if (value instanceof LodashWrapper) {
return value;
}
if (hasOwnProperty.call(value, '__wrapped__')) {
return wrapperClone(value);
}
}
return new LodashWrapper(value);
}
/**
* The base constructor for creating `lodash` wrapper objects.
*
* @private
* @param {*} value The value to wrap.
* @param {boolean} [chainAll] Enable chaining for all wrapper methods.
* @param {Array} [actions=[]] Actions to peform to resolve the unwrapped value.
*/
function LodashWrapper(value, chainAll, actions) {
this.__wrapped__ = value;
this.__actions__ = actions || [];
this.__chain__ = !!chainAll;
}
/*------------------------------------------------------------------------*/
/**
* Creates a new array joining `array` with `other`.
*
* @private
* @param {Array} array The array to join.
* @param {Array} other The other array to join.
* @returns {Array} Returns the new concatenated array.
*/
function arrayConcat(array, other) {
return arrayPush(copyArray(array), values);
}
/**
* A specialized version of `baseExtremum` for arrays which invokes `iteratee`
* with one argument: (value).
*
* @private
* @param {Array} array The array to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @param {Function} comparator The function used to compare values.
* @param {*} exValue The initial extremum value.
* @returns {*} Returns the extremum value.
*/
function arrayExtremum(array, iteratee, comparator, exValue) {
var index = -1,
length = array.length,
computed = exValue,
result = computed;
while (++index < length) {
var value = array[index],
current = +iteratee(value);
if (comparator(current, computed) || (current === exValue && current === result)) {
computed = current;
result = value;
}
}
return result;
}
/**
* Appends the elements of `values` to `array`.
*
* @private
* @param {Array} array The array to modify.
* @param {Array} values The values to append.
* @returns {Array} Returns `array`.
*/
function arrayPush(array, values) {
return array.push.apply(array, values);
}
/**
* Assigns `value` to `key` of `object` if the existing value is not equivalent
* using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
* for equality comparisons.
*
* @private
* @param {Object} object The object to augment.
* @param {string} key The key of the property to assign.
* @param {*} value The value to assign.
*/
function assignValue(object, key, value) {
var oldValue = object[key];
if ((value === value ? (value !== oldValue) : (oldValue === oldValue)) ||
(value === undefined && !(key in object))) {
object[key] = value;
}
}
/**
* The base implementation of `_.create` without support for assigning
* properties to the created object.
*
* @private
* @param {Object} prototype The object to inherit from.
* @returns {Object} Returns the new object.
*/
var baseCreate = (function() {
function object() {}
return function(prototype) {
if (isObject(prototype)) {
object.prototype = prototype;
var result = new object;
object.prototype = undefined;
}
return result || {};
};
}());
/**
* The base implementation of `_.delay` and `_.defer` which accepts an array
* of `func` arguments.
*
* @private
* @param {Function} func The function to delay.
* @param {number} wait The number of milliseconds to delay invocation.
* @param {Object} args The arguments provide to `func`.
* @returns {number} Returns the timer id.
*/
function baseDelay(func, wait, args) {
if (typeof func != 'function') {
throw new TypeError(FUNC_ERROR_TEXT);
}
return setTimeout(function() { func.apply(undefined, args); }, wait);
}
/**
* The base implementation of `_.forEach` without support for callback shorthands.
*
* @private
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @returns {Array|Object} Returns `collection`.
*/
var baseEach = createBaseEach(baseForOwn);
/**
* The base implementation of `_.every` without support for callback shorthands.
*
* @private
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} predicate The function invoked per iteration.
* @returns {boolean} Returns `true` if all elements pass the predicate check, else `false`
*/
function baseEvery(collection, predicate) {
var result = true;
baseEach(collection, function(value, index, collection) {
result = !!predicate(value, index, collection);
return result;
});
return result;
}
/**
* The base implementation of `_.filter` without support for callback shorthands.
*
* @private
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} predicate The function invoked per iteration.
* @returns {Array} Returns the new filtered array.
*/
function baseFilter(collection, predicate) {
var result = [];
baseEach(collection, function(value, index, collection) {
if (predicate(value, index, collection)) {
result.push(value);
}
});
return result;
}
/**
* The base implementation of methods like `_.find` and `_.findKey` without
* support for callback shorthands, which iterates over `collection` using
* the provided `eachFunc`.
*
* @private
* @param {Array|Object} collection The collection to search.
* @param {Function} predicate The function invoked per iteration.
* @param {Function} eachFunc The function to iterate over `collection`.
* @param {boolean} [retKey] Specify returning the key of the found element instead of the element itself.
* @returns {*} Returns the found element or its key, else `undefined`.
*/
function baseFind(collection, predicate, eachFunc, retKey) {
var result;
eachFunc(collection, function(value, key, collection) {
if (predicate(value, key, collection)) {
result = retKey ? key : value;
return false;
}
});
return result;
}
/**
* The base implementation of `_.flatten` with support for restricting flattening.
*
* @private
* @param {Array} array The array to flatten.
* @param {boolean} [isDeep] Specify a deep flatten.
* @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
* @param {Array} [result=[]] The initial result value.
* @returns {Array} Returns the new flattened array.
*/
function baseFlatten(array, isDeep, isStrict, result) {
result || (result = []);
var index = -1,
length = array.length;
while (++index < length) {
var value = array[index];
if (isObject(value) && isArrayLike(value) &&
(isStrict || isArray(value) || isArguments(value))) {
if (isDeep) {
// Recursively flatten arrays (susceptible to call stack limits).
baseFlatten(value, isDeep, isStrict, result);
} else {
arrayPush(result, value);
}
} else if (!isStrict) {
result[result.length] = value;
}
}
return result;
}
/**
* The base implementation of `baseForIn` and `baseForOwn` which iterates
* over `object` properties returned by `keysFunc` invoking `iteratee` for
* each property. Iteratee functions may exit iteration early by explicitly
* returning `false`.
*
* @private
* @param {Object} object The object to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @param {Function} keysFunc The function to get the keys of `object`.
* @returns {Object} Returns `object`.
*/
var baseFor = createBaseFor();
/**
* The base implementation of `_.forOwn` without support for callback shorthands.
*
* @private
* @param {Object} object The object to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @returns {Object} Returns `object`.
*/
function baseForOwn(object, iteratee) {
return object && baseFor(object, iteratee, keys);
}
/**
* The base implementation of `_.functions` which creates an array of
* `object` function property names filtered from those provided.
*
* @private
* @param {Object} object The object to inspect.
* @param {Array} props The property names to filter.
* @returns {Array} Returns the new array of filtered property names.
*/
function baseFunctions(object, props) {
var index = -1,
length = props.length,
resIndex = -1,
result = [];
while (++index < length) {
var key = props[index];
if (isFunction(object[key])) {
result[++resIndex] = key;
}
}
return result;
}
/**
* The base implementation of `_.isEqual` which supports partial comparisons
* and tracks traversed objects.
*
* @private
* @param {*} value The value to compare.
* @param {*} other The other value to compare.
* @param {Function} [customizer] The function to customize comparisons.
* @param {boolean} [isLoose] Specify performing partial comparisons.
* @param {Array} [stackA] Tracks traversed `value` objects.
* @param {Array} [stackB] Tracks traversed `other` objects.
* @returns {boolean} Returns `true` if the values are equivalent, else `false`.
*/
function baseIsEqual(value, other, customizer, isLoose, stackA, stackB) {
if (value === other) {
return true;
}
if (value == null || other == null || (!isObject(value) && !isObjectLike(other))) {
return value !== value && other !== other;
}
return baseIsEqualDeep(value, other, baseIsEqual, customizer, isLoose, stackA, stackB);
}
/**
* A specialized version of `baseIsEqual` for arrays and objects which performs
* deep comparisons and tracks traversed objects enabling objects with circular
* references to be compared.
*
* @private
* @param {Object} object The object to compare.
* @param {Object} other The other object to compare.
* @param {Function} equalFunc The function to determine equivalents of values.
* @param {Function} [customizer] The function to customize comparisons.
* @param {boolean} [isLoose] Specify performing partial comparisons.
* @param {Array} [stackA=[]] Tracks traversed `value` objects.
* @param {Array} [stackB=[]] Tracks traversed `other` objects.
* @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
*/
function baseIsEqualDeep(object, other, equalFunc, customizer, isLoose, stackA, stackB) {
var objIsArr = isArray(object),
othIsArr = isArray(other),
objTag = arrayTag,
othTag = arrayTag;
if (!objIsArr) {
objTag = objToString.call(object);
if (objTag == argsTag) {
objTag = objectTag;
}
}
if (!othIsArr) {
othTag = objToString.call(other);
if (othTag == argsTag) {
othTag = objectTag;
}
}
var objIsObj = objTag == objectTag && !isHostObject(object),
othIsObj = othTag == objectTag && !isHostObject(other),
isSameTag = objTag == othTag;
if (isSameTag && !(objIsArr || objIsObj)) {
return equalByTag(object, other, objTag);
}
if (!isLoose) {
var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
if (objIsWrapped || othIsWrapped) {
return equalFunc(objIsWrapped ? object.value() : object, othIsWrapped ? other.value() : other, customizer, isLoose, stackA, stackB);
}
}
if (!isSameTag) {
return false;
}
// Assume cyclic values are equal.
// For more information on detecting circular references see https://es5.github.io/#JO.
stackA || (stackA = []);
stackB || (stackB = []);
var length = stackA.length;
while (length--) {
if (stackA[length] == object) {
return stackB[length] == other;
}
}
// Add `object` and `other` to the stack of traversed objects.
stackA.push(object);
stackB.push(other);
var result = (objIsArr ? equalArrays : equalObjects)(object, other, equalFunc, customizer, isLoose, stackA, stackB);
stackA.pop();
stackB.pop();
return result;
}
/**
* The base implementation of `_.iteratee`.
*
* @private
* @param {*} [func=_.identity] The value to convert to an iteratee.
* @returns {Function} Returns the iteratee.
*/
function baseIteratee(func) {
var type = typeof func;
if (type == 'function') {
return func;
}
return func == null
? identity
: (type == 'object' ? baseMatches : baseProperty)(func);
}
/**
* The base implementation of `_.keysIn` which doesn't skip the constructor
* property of prototypes or treat sparse arrays as dense.
*
* @private
* @param {Object} object The object to query.
* @returns {Array} Returns the array of property names.
*/
function baseKeysIn(object) {
var result = [];
for (var key in object) {
result.push(key);
}
return result;
}
// An alternative implementation intended for IE < 9 with es6-shim.
if (enumerate && !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf')) {
baseKeysIn = function(object) {
var data,
iterator = enumerate(object),
result = [];
while (!(data = iterator.next()).done) {
result.push(data.value);
}
return result;
};
}
/**
* The base implementation of `_.map` without support for callback shorthands.
*
* @private
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @returns {Array} Returns the new mapped array.
*/
function baseMap(collection, iteratee) {
var index = -1,
result = isArrayLike(collection) ? Array(collection.length) : [];
baseEach(collection, function(value, key, collection) {
result[++index] = iteratee(value, key, collection);
});
return result;
}
/**
* The base implementation of `_.matches` which doesn't clone `source`.
*
* @private
* @param {Object} source The object of property values to match.
* @returns {Function} Returns the new function.
*/
function baseMatches(source) {
return function(object) {
var props = keys(object),
length = props.length;
if (object == null) {
return !length;
}
object = Object(object);
while (length--) {
var key = props[length];
if (!(key in object && baseIsEqual(source[key], object[key], undefined, true))) {
return false;
}
}
return true;
};
}
/**
* The base implementation of `_.pick` without support for individual
* property names.
*
* @private
* @param {Object} object The source object.
* @param {string[]} props The property names to pick.
* @returns {Object} Returns the new object.
*/
function basePick(object, props) {
object = Object(object);
var index = -1,
length = props.length,
result = {};
while (++index < length) {
var key = props[index];
if (key in object) {
result[key] = object[key];
}
}
return result;
}
/**
* The base implementation of `_.property` without support for deep paths.
*
* @private
* @param {string} key The key of the property to get.
* @returns {Function} Returns the new function.
*/
function baseProperty(key) {
return function(object) {
return object == null ? undefined : object[key];
};
}
/**
* The base implementation of `_.reduce` and `_.reduceRight` without support
* for callback shorthands, which iterates over `collection` using the provided
* `eachFunc`.
*
* @private
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} iteratee The function invoked per iteration.
* @param {*} accumulator The initial value.
* @param {boolean} initFromCollection Specify using the first or last element of `collection` as the initial value.
* @param {Function} eachFunc The function to iterate over `collection`.
* @returns {*} Returns the accumulated value.
*/
function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) {
eachFunc(collection, function(value, index, collection) {
accumulator = initFromCollection
? (initFromCollection = false, value)
: iteratee(accumulator, value, index, collection);
});
return accumulator;
}
/**
* The base implementation of `_.slice` without an iteratee call guard.
*
* @private
* @param {Array} array The array to slice.
* @param {number} [start=0] The start position.
* @param {number} [end=array.length] The end position.
* @returns {Array} Returns the slice of `array`.
*/
function baseSlice(array, start, end) {
var index = -1,
length = array.length;
start = start == null ? 0 : toInteger(start);
if (start < 0) {
start = -start > length ? 0 : (length + start);
}
end = (end === undefined || end > length) ? length : toInteger(end);
if (end < 0) {
end += length;
}
length = start > end ? 0 : ((end - start) >>> 0);
start >>>= 0;
var result = Array(length);
while (++index < length) {
result[index] = array[index + start];
}
return result;
}
/**
* The base implementation of `_.some` without support for callback shorthands.
*
* @private
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} predicate The function invoked per iteration.
* @returns {boolean} Returns `true` if any element passes the predicate check, else `false`.
*/
function baseSome(collection, predicate) {
var result;
baseEach(collection, function(value, index, collection) {
result = predicate(value, index, collection);
return !result;
});
return !!result;
}
/**
* The base implementation of `_.values` and `_.valuesIn` which creates an
* array of `object` property values corresponding to the property names
* of `props`.
*
* @private
* @param {Object} object The object to query.
* @param {Array} props The property names to get values for.
* @returns {Object} Returns the array of property values.
*/
function baseValues(object, props) {
var index = -1,
length = props.length,
result = Array(length);
while (++index < length) {
result[index] = object[props[index]];
}
return result;
}
/**
* The base implementation of `wrapperValue` which returns the result of
* performing a sequence of actions on the unwrapped `value`, where each
* successive action is supplied the return value of the previous.
*
* @private
* @param {*} value The unwrapped value.
* @param {Array} actions Actions to peform to resolve the unwrapped value.
* @returns {*} Returns the resolved value.
*/
function baseWrapperValue(value, actions) {
var result = value;
var index = -1,
length = actions.length;
while (++index < length) {
var action = actions[index];
result = action.func.apply(action.thisArg, arrayPush([result], action.args));
}
return result;
}
/**
* Copies the values of `source` to `array`.
*
* @private
* @param {Array} source The array to copy values from.
* @param {Array} [array=[]] The array to copy values to.
* @returns {Array} Returns `array`.
*/
function copyArray(source, array) {
var index = -1,
length = source.length;
array || (array = Array(length));
while (++index < length) {
array[index] = source[index];
}
return array;
}
/**
* Copies properties of `source` to `object`.
*
* @private
* @param {Object} source The object to copy properties from.
* @param {Array} props The property names to copy.
* @param {Object} [object={}] The object to copy properties to.
* @returns {Object} Returns `object`.
*/
function copyObject(source, props, object) {
object || (object = {});
var index = -1,
length = props.length;
while (++index < length) {
var key = props[index];
assignValue(object, key, source[key], object[key]);
}
return object;
}
/**
* This function is like `copyObject` except that it accepts a function to
* customize copied values.
*
* @private